package com.hyh.eblog.controller;


import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;

@Controller
public class CodeController {

    private static final Logger log = LoggerFactory.getLogger(CodeController.class);


    @Resource
    private Producer producer;

    @GetMapping("/kaptcha")
    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {

        HttpSession session = request.getSession();
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");
        response.setContentType("image/jpeg");
        //生成验证码
        String kapText = producer.createText();
        log.info("生成的验证码为 : {}",kapText);
        //向客户端写出图片
        BufferedImage bi = producer.createImage(kapText);
        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, kapText);

        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            out.close();
        }
    }
}
